with builtins; {

  resource = {

    graylog_pipeline_connection = {
      journald.pipeline_ids = [ "\${graylog_pipeline.nextcloud.id}" ];
    };

    graylog_pipeline = {
      nextcloud.source = ''
        pipeline "nextcloud : parsing"
          stage 10 match either
            rule "nextcloud : parse level 1"
          stage 11 match either
            rule "nextcloud : parse level 2"
        end
      '';
    };

    graylog_pipeline_rule = {
      nextcloudLevel1.source = ''
        rule "nextcloud : parse level 1"
        when
            has_field("systemd_unit") && $message.systemd_unit == "phpfpm-nextcloud.service"
        then
          let parsedJson = parse_json(to_string($message.message));
          set_fields(to_map(parsedJson),"nextcloud_");
        end
      '';
      nextcloudLevel2.source = ''
        rule "nextcloud : parse level 2"
        when
            has_field("nextcloud_message")
        then
          let parsedJson = parse_json(to_string($message.nextcloud_message));
          set_fields(to_map(parsedJson),"nextcloud_message_");
        end
      '';
    };

  };
}